Combined drilling and reaming machine.



W. H. TAMBS. COMBINED DmLLl'NG AND REAMsNG MACHINE.

APPLICATION FILED JUNE 18, .917.

Patented Dee.. 4,191?.

on line 3 3, Fig. 2.V

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VSpecification of Letters Patent.

Applcaton led 31111618, 191'?. ,Serial No. 175,469,

with the accompanying drawings, is a full,

clear, and exact description.

Y rlhis invention relates to certain improvements in combined drilling and rearning machines, preferably of the automatic multiple-head type in which each tool-support ing head is mechanically reciprccated to and from the work to cause thev tool -or tools to perform the necessary operation thereon, in combination with suitable means coperating with the head for alternately interchanging the positions of the tools for successive operation upon the same part of the work.

In the usual type of machine .for drilling purposes only, it is eustom'aryto use a gig with guide bushings therein which have to be removed when the drills are replaced by reamers for properly sizing the' previously drilled holes, and one'of the objects of my present invention is to obviate theV necessity for removing these guide bushings.

A further object is to render this interchange of position of the tools, such for example as a drill and reamer, entirely automatic Vso that the drilling and reaming' operations may be performed mechanically and successively without attention on the part of the operator and without removing or replacing the tools.

i Other objects and uses relating to speciiic parts of the machine will be brought out in the following description.

lin the drawings Figure 1 is a side elevation, partly in section, of one of the reciprocating tool-carrying heads and guide therefor, together with the means for rotating the tool-chucks, and

- means for interchanging their positions.

Fig. 2 is an end-face view, partly in section, of the parts shown in Fig. l.

Fig.` 3 is an enlarged sectional view taken f Fig. 4 is a detail sectional view taken on line 4 4, Fig. l. Y

The mechanism shown is a part of a quadruple drill press, commonly used for simultaneously drilling thefour holes of. a difthe guide-way 4 ferential gear case for receiving the supporting spindles for the pinions, and comprises a head 1 -adapted to be reciprocated by vany suitable operating means, not necessary to herein illustrate or describe, along a guide-way 2 said head being provided` with coeaxi al bearings 3 and parallel with and. some distance to one side of 1 Q in which is journaled a shaft 5 adapted to be rotated by any y suitable driving means, not shown.

The bearing lt preferably consists 0f a threaded bushing screwing into one 4end of the head to take up the wear of an endthrust bearing 6 and also to resistV the endwise movementof the shaft in one direction.

The opposite end of the head in which the bearing 3 is formed is provided with an opening. 7 parallel with and some" distance to one side, of the shaft 5 for re ceiving one end of a stationary threaded spindle 8 4which is rigidly clamped in place by means of an annular shoulder Q and a nut 10 engaging the head at opposite ends of the opening 7 y A pinion 11 is keyed or otherwise secured to the end of the shaft 5 to rotate in a recess l2 in the outer face of thevhead close to the corresponding end of `the bearing 3 and meshes with an idler gear 13 which is loosely mounted on the stationary spindle 8 in the same vrecess 12 so as to be rotated continuously by the pinion 11 An endthrust bearing M is inter posed between the collar Q and adjacent face of the gear 13 to reduce friction l,between those parts.`

Thespindle 8 extends through and some distance beyond the front face of the head and upon it is journaled a relatively large circular disk 15 which is held in place by a nut l6 engaging the outer threaded end of the spindle 8 but may be removed at any time by simply removing the nut 1G 1 `This disk is provided with a pair of diametrically opposite bearings 17- parallel with and equal distances from the axis of the spindle S corresponding to the distance between said axis and that of the shaft 5 for receiving and supporting a pair of rotary tool-carrying chucks, each consisting of abushing l8 having an axially tapered opening 19 and a hollow Patented Dec. 4t, i917..

tapered sleeve fitted in its tapered opening, one ofthe sleeves serving to re' ceive and hold a drill, as -a-, while the other sleeve is adapted to receive and hold a reanier -b-.

"The inner ends of the bushings l8- vare preferably reduced and threaded, and

upon these threaded ends are screwed internally threadedjpinions 2lboth of the saine size as the pinion 1l-and mesh with diametrically oppositeY sides Y'of the 'idleijgeai-lB-f which is of suiicientface "widthg'to engage both gears --11-. and Y- `2'1 end'to V end, the pinions -21- being disposed in the same plane of rotation at the Y outer endof the pinion ll-Q The outer end face ofthe head -1- is cent .end of the idler -l3-, thus permitting lthe disk .with the pinions '21- thereon toturnfreely about the aXis of the spindle 8-. Y

' "lhe' adjacent facesof the disk -15- and idlerggear-'lare recessedto receive a coil' spring around the spindle -S-,

, said'spring being tensioned yto produce sufiic ien't frictionbetween' those parts to cause l the rotation ofthe disk by andin the saine -direction as the idlerv gear when the disk is released by its locking means, presently described.

Thislocking neaiis-consists of a sliding l bolt ,-,25- movable parallel with the avis .ofthe spindle 8; in an opening in the head leand intoand out of one orv the other of a pair of diametrically opposite sockets -26- in the innery face of the disk -i5 "A lever -27- is pivoted at'-28`- intermediate its ends to a stud -29- on the head and has one end connected by a nut and coil' spring -31- to the locking bolt Q5- and its Yother yend connected to a reciprocatory operating rod -32- Vwhich is slidably mounted in suitable bearings -BS- on the head lf parallel with the vThis operating rod -32- is provided -86- on the guide -2-.

with aV vcollar 34- adjustable lengthwise thereof and held in place by a set screw +35- to coperate with a limitingstop v ik stop pin -37- is slidable endwise in an-opening in the head -l Iinto and out of the pathof one or the otherof a pair of 6ojecting' from lthe periphery ofthe disk l5- diainetrically opposite shoulders 3S- proand Vispivotally connected at -39- tort-he `lever L27- between 4the pivot w28- and f' f point of connection of said lever with the operating lrod -82.-.

It is, therefore, apparent that the locking bolt +25--l aiid stop pin -.37- are connected to the lever -27- at opposite sides of the pivot 2S- so that when the lever is rocked in one direction, it will withdraw Y the bolt M25 from its locking position and force the locking pin 37- into the path of movement ofl one of the shoulders -38- and vice versa will force the locking bolt to its locking position and simultaneously withdraw the locking pin.

Y The lever -27- is operated in one direction by a retractiiig spring iO- surrounding the stop pin -37- between the head of said pin and adjacent face of the head -l-, said spring -JLO- being somewhat stiller .than the spring -3lso as to withdraw the pin -37- out of the path of the shoulders -38 and simultaneously force the locking pin Q5- to its locking position for i holding the disk 15 against rotation during the drilling or reaming operation which isaccoinplished by the forward movement of the head -l by any suitable mechanism, not shown.

vThe collar 3&1h is adjusted so that when the head carrying the rod 3Qy is drawn back suiiiciently to withdraw the tools laand from the work, the collar 34.- will engage the limiting stop -3G- before the head reaches the end of its return movement, thereby operating the lever -27- to withdraw the locking bolt Q5- from its locking position and simultaneously `force the stop pin -37- into the path of movenient of the shoulders -ZlS-, whereupon the friction produced by the spring 21H will cause the continuously rotating idler gear -l3- to rotate the disk -l5-, thereby interchanging position of the tools` rt-- and as for example when it is desired to ream the hole previously made by-tlie drill a-.

The shoulders -38- have a slight circumferential movement relatively to" the disk -15- and are preferably pivoted at hdlto said disk to more between opposed shoulders 42'- against the action of retracting springs -48-, one foreach shoulder.

The object of this slight circumferential movement of the stop shoulders 3S-i is to permit them to take a position ahead of the locking pin S7- when said pinis'witlii drawn and the disk is locked. by Vthe bolt -25- so lthat when the'bolt is withdrawn and the locking pin is forced to its holding position, the'disk will be free tov make substantially a half revolution untilfthe next shoulder *38- encounters the locking pin and is'forced to the limit of its iiiovei'nentl against the action of a retracting spring -43--, whereupon the further rotation of the disk is stopped in such position as to enable the locking bolt 25- to enter the alined socket 26- in said disk as the locking pin B7- is withdrawn.

This interchange of positions of the tools -ct and -J- is repeated at each cycle of forward and return movement of the head -1-. l

That is, the head is lirst advanced to drill the hole in the work and then returned from the work, whereupon the disk is rotated substantially a half turn to interchange the position of .the reamer and drill so that during the next cycle of movement of the head, the reamer will be forced into and out of the work to perform its function.

What I claim is:

1. In a combined drilling and reaming device, the combination of a reciprocatory head, a rotary member mounted on the head, a drill support and a reamer'support, both mounted on the rotary member equal distances from the axis thereof, means for rotating said supports relatively to the rotary member, and automatic .means controlled by the reciprocatory movement of the head lor locking and releasing the rotary member.

2. In a combined drilling and reaming device, the combination of a reciprocatory head, a rotary member mounted on the head, a drill support and a reamer support, both mounted on the rotary member equal distances from the axis thereof, means for rotating said supports relatively to the rotary member, automatic means controlled by the reciprocatory movement of the head for locking and releasing the rotary member, and means for moving said member rotarily when the latter is unlocked.

3. In a combined drilling and reaming device, the combination of a reciprocatory head, a rotary member mounted on the head, a drill support and a reamer support, both mounted on the rotary member equal distances from the axis thereof, means for rotatingr said supports relatively to the rotary member, automatic means controlled by the reciprocatory movement of the head Jfor locking and releasing the rotary member, means for moving said member rotarily when the latter is unlocked, and additional means for stopping the rotary movement of said member when the latter is released.

Zl. ln a device of the character described,

the combination of a reciprocatory head and a guide therefor, a disk rotatably mounted on the head, a pair of tool-supporting chucks rotatably mounted on'the disk equal distances from the axis of said disk, driving means for rotating the chucks, and means for automatically locking and releasing the disk.

5. ln a device of the character described, the combination of a reciprocatory head and a guide therefor, a disk rotatably mounted on the head, a pair of tool-supporting chucks rotatably mounted on the disk equal distances from the axis of said disk, driving means for rotating the chucks, means for automatically locking and releasing `the disk, and means for transmitting rotary motion from a portion of said driving means to the disk when the latter is released.

6. Vln a device of the character described, the combination of a reciprocatory head, a guide therefor, a disk rotatably mounted on the head, tool-holding chucks rotatably mounted on the disk at equal distances :from its axis, driving means for rotating said chucksv in the same direction, additional means actuated by a part of said driving means for rotating the disk when released to interchange the position of the chucks, and means for locking said disk when the position oi"- the chucks are interehanged.

` 7. lin a devieecof the character described, the combination of a reciprocatory head, a disk rotatably mounted thereon, tool-holders rotatably mounted on the disk at equal distances from the axis thereof, driving means for said tool-holders, and means actuated by a part of the driving means for rotating the disk to successively present the toolholders to the same position.

In witness whereof ll have hereunto set my hand this 16th day of June, 1917.

WILLlAM H. TAMBS.

Witness:

H. E. CHASE.

@einem or' this patent mann be obtained for ve cents each, by addressing the Gommissioner of Patents,

Washington, E. lll. 

